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---
tags:
- python
- testing
- pytest
references:
- https://docs.pytest.org/en/stable/explanation/anatomy.html#test-anatomy
---
Tests look at the result of how the system under test (SUT) responds to a certain input. It shouldn't care too much about how or why something was done, but mainly about what was done.
A test can be seperated into four stages:
- Arrange: prepares everything needed to run the test.
- Act: the singular action that triggers the behaviour that's being tested.
- Assert: looking at what changed in response to the action.
- Cleanup: make sure that tests do not influence other tests - by resetting to a "clean" state.
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